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Rhodium‐Catalyzed Methanation and Methane Steam Reforming Reactions on Rhodium–Perovskite Systems: Metal–Support Interaction
Author(s) -
Thalinger Ramona,
Götsch Thomas,
Zhuo Chen,
Hetaba Walid,
Wallisch Wolfgang,
StögerPollach Michael,
Schmidmair Daniela,
Klötzer Bernhard,
Penner Simon
Publication year - 2016
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201600262
Subject(s) - methanation , rhodium , catalysis , metal , oxide , perovskite (structure) , steam reforming , methane , reactivity (psychology) , inorganic chemistry , hydrogen , alloy , chemical engineering , materials science , chemistry , hydrogen production , metallurgy , crystallography , organic chemistry , engineering , medicine , alternative medicine , pathology
Abstract Metal–support interaction in rhodium–perovskite systems was studied using LSF (La 0.6 Sr 0.4 FeO 3− δ ) and STF (SrTi 0.7 Fe 0.3 O 3− δ ) supports to disentangle different manifestations of strong or reactive metal–support interaction. Electron microscopy and catalytic characterization in methane steam reforming/CO 2 methanation reveal that reduction in hydrogen at 673 K and 873 K causes different extents of Fe exsolution. Depending on the perovskite reducibility, Fe–Rh alloy particles are observed. No signs of strong metal–support interaction (i.e., encapsulation of metal particles) by reduced oxide species were observed. As re‐oxidation in oxygen at 873 K did not fully restore the initial structures, the interaction between Rh and the perovskites manifests itself in irreversible alloy formation. Catalytic effects are the suppression of methane reactivity with increasing prereduction temperature. The results show the limits of the strong metal–support interaction concept in complex metal–oxide systems.